Platen mechanism for type-writing machines.



J; RABER.

PLATBN MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED FEBFIQ, 1909.

1,027,391, Patehted May 21, 1912.

UNITED STATES ragnntr orrion.

JOSEPH RABER, OF 'POPLAR "BLUFF, MISSOURI, ASSIGNOR TO ADDING TYPEWRITERCOMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

I'LA'IEN MECHANISM FOR TYPE-WRITING- MACHINES.

Bluff, Missouri, have invented a new and useful Platen Mechanism forType-\Vriting Machines, of which the following is a specification.

This invention relates toplaten mecha-.

nisms for typewrit-ing machines, and has for its object to providedevices arranged to cooperate with a rat'chetwheel on the platen shafteffectively to adjust the platen at'the exact position desired at whichline space movement in combination. with friction devices arranged tocooperatewith the platenwhereby the platen will be held iii-any desiredadjustment, and controlling means whereby any of saiddevices may bebrought into operative position. j

In the drawings Figure 1 is a perspective view of the subject matter ofthe present in vention detached from the platen. -Fig.' '2 is asectional view taken on the line 2-2 of Fig. 4. Fig. 3 is a sectionalview taken on the line of Fig. 4: showing the friction devices inconnection with a platen. Fig. is a front elevation of a portion of theplaten having'my present invention arranged to cooperate therewith. Fig.5 is a perspective view of the controlling or operating shaft wherebythe line space controlling devices and the friction devices areoperated.

The platen 1 is of the usual construction mounted on a shaft 2. wherebythe platen may be rotated to move the paper longitudinally in its linespacing movements. A

feed ratchet wheel 3 is attached on the shaft for cooperation with anysuitable line space mechanism the arrangement and construction of whichare immaterial to thepresent inventionf A second ratchet wheel isinterposed between the end of the platen and the wheel 3 being also inrigid connection with the platen shaft. A. shaft 5 is sup ported.parallel with the platen shaft 2 and carries a bracket 6 in which isjournaled a shaft or spindle 7. Upon the shaft 5 two curved arms 8 arepivoted and carry rollers 9 on their free ends. 7 Asprmg 10 connects thearms 8 acting to hold the rollers 9 in engagementwith the teeth on theperiphery of the wheel 4;, so that when the platen is oper-' ated tomove the'paper in line spacing, the tension ofthe spring 10 will causethe rollers 9 to act upon the wheel 4 effectively to move and hold theplaten'at the exact adjustment desired. The arms 8 have extensionsbeyond the shaft 5 which embrace the spindle 7.. The spindle 7 is formedwith a narrow portion 7 formed by cutting away portions of the oppositesides thcreof,'said narrow portion being embraced by the extendedportions of the arms 8- as shown in Fig. 2. lVhen the spindle 7,is-adjusted as' shown in Fig. 2. the rollers 9 are held in engagementwith the ratchet wheel 4: by their spring 10, but rotation of'thespindle will operate the arms 8 effectively to raise the rollers 9 outof engagement with the wheel t into the position shown in Fig. 3,thereby permitting the platen to stop in any position.

12 indicates two curved arms pivoted upon the shaft 5 having their freeends extending between the end of the platen and the ratchet wheel 4..and their opposite ends provided with extensionsv on opposite sides ofthe spindle'i. The arms 12 are connected by a spring 13 acting to drawthe free ends of said armsint-o contact with a hub or collar 14 on theplaten shaft between the end of the platen and the wheel 4. v

A narrow portion 7 is formed on the spindle 7 and is arranged tocoi'iperat'e with the extensions of the arms 12 in such manner that saidarms will be held' out-of engagement with 'thehub or collar ll when isattached to the spindle 7 constituting manually operable means forturning said Specification of Letters Patent. Patented Blay 21, 1912,

Application filed February 19, 1909. Serial No. 478,970.

spindle as required to operate the arms 8 Y or 12. thebracket (l and hasone end arranged to cooperate with the fiat surfaces 7 on the head ofthe spindle 7 to hold said spindle and the arms 8 and 12in theirdifferent A spring plate 16 is attached tov placed, whether incomplete'line' space position or in any fractional portion of the linespace.

I am aware that there may be modifications and alterations in theconstruction and i arrangement of the parts embodying this inventionwithout departure froxnthe spirit and scope of the invention, and I donot restrict myself to identical features of construction orarrangement, but

What I claim'and desire to securely Let-- ters Patent is--- I 1-. Thecombination with a platen, a wheel rigid therewith having teeth on itsperiph- 'ery, arms arranged to engage with said ratchet wheel, frictiondevices, and a lever operabletorelease said arms from engagement withsaid ratchet wheeland to cause i5,

said friction devices -to operate, substantially asspecified.

. 2i-The combination with a laten, a ratchet wheel rigid therewitlnanda'hub or collar rigid with said ratchet wheel and platen, of friction,devices operable-i0 engage with'said hub or collar, arms arranged toengage wi said ratchet wheel, and a 3. The combination with a platen, ofa shaft or spindle devices for holding the platen inexact pcsition ateach line space so ration, a spring for actuatin said de-' vicest'oQhold said platen, a friction device rate with the platen whendevices are inoperative, a

arran ed to 006 said ISlV-Ilitlll spring for'actuating said, frictiondevice to coiiperatewith the platen, an element for operating said shaftor spindle effectively to actuate said first-named devices or saidfriction devices to different adjustments, I

to engage with said wheel, a friction device pivoted on said shaft andarranged to cooperate with the .platen when said detent is ino erative,a lever operable to disengage said etent from said wheel and to causesaid friction device to move to position efiective to restrain rotationof said platen, separate springs for actuating said detent and saidfriction device, and an element arranged to hold said friction deviceinthe position aforesaid, substantially as specified.

5. In a typewriting machine, a platen, a wheel rigid with said platen, adetent arranged to engage with said wheel, a spring actuating saiddetent, a friction device, a separate spring actuating said frictiondevice, a lever controlling said detent and said friction device,to-move them inopposition to said s rings at dilferent times, and alatch hol in I said detent and said friction device-in di erentadjustment, substantially as specified.

In testimony whereof, I hereunto afiix my si ature to this specificationthis 28th day 0 January, 1909, in the presence of two witnesses. I

JOSEPH RABER. [1,. s.]

Witnesses: I

' CHARLES PIcKLEs,

JOHN E. Gnnvn,

